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danbri / gist:8739451
Created January 31, 2014 18:37
Hi folks. I'm relaying this from the schema.org collaboration, probably the main user of HTML's Microdata mechanism.
We'd (schema.org 'we') like to make a public proposal to update Microdata with a syntax for expressing inverse properties/relationships. FWIW other notations that schema.org supports (JSON-LD and RDFa) have such mechanisms ([1],[2]).
At schema.org we are repeatedly running into situations where we have a need for properties to be used in reverse direction. There are 630 or so properties defined currently (and a similar number of types); see listing at http://schema.org/docs/full.html. Inverse properties are relatively a cornercase, but a persistent one.
By inverse, I refer to scenarios where there are any pair of properties (relationship types) e.g. "foo" and "bar", such that whenever some entity-1 has a foo relationship to an entity-2, then by definition, entity-2 will have a "bar" relationship to entity-1. We'd like to avoid the need to give "bar" a specific name, and instead be able to
@danbri
danbri / gist:9053981
Created February 17, 2014 16:34
<html prefix="og: http://ogp.me/ns#">
<head>
<title>The Rock (1996)</title>
<meta property="og:title" content="The Rock" />
<meta property="og:type" content="video.movie" />
<meta property="og:url" content="http://www.imdb.com/title/tt0117500/" />
<meta property="og:image" content="http://ia.media-imdb.com/images/rock.jpg" />
<meta property="schema:image" content="http://ia.media-imdb.com/images/rock.jpg" />
...
@danbri
danbri / gist:9054032
Created February 17, 2014 16:36
<html prefix="og: http://ogp.me/ns#">
<head>
<title>The Rock (1996)</title>
<meta property="og:title" content="The Rock" />
<meta property="og:type" content="video.movie" />
<meta property="og:url" content="http://www.imdb.com/title/tt0117500/" />
<meta property="og:image schema:image" content="http://ia.media-imdb.com/images/rock.jpg" />
...
</head>
...
@danbri
danbri / gist:9054084
Created February 17, 2014 16:38
<html prefix="og: http://ogp.me/ns#">
<head>
<meta property="og:title" content="The Rock" />
<meta property="og:url" content="http://www.imdb.com/title/tt0117500/" />
<meta property="og:image schema:image" content="http:/helloworld.jpg" />
...
</head>
...
</html>
@danbri
danbri / gist:9054103
Created February 17, 2014 16:39
<html prefix="og: http://ogp.me/ns#">
<head>
<meta property="og:title" content="The Rock" />
<meta property="og:url" content="http://www.imdb.com/title/ttxxx0117500/" />
<meta property="og:image schema:image" content="http:/helloworld.jpg" />
...
</head>
...
</html>
@danbri
danbri / gist:9097193
Created February 19, 2014 17:38
{
"@context": {
"@vocab": "http://schema.org/",
"url": {
"@type": "@id"
},
"@base": "http://aaa.com"
},
"@type": "Movie",
"@id": "http://code.sgo.to/movies/123",
@danbri
danbri / gist:9145249
Created February 21, 2014 22:51
<div vocab="http://schema.org/" typeof="PlaceOfWorship https://www.wikidata.org/wiki/Q199451">
<span property="name">Pagoda Songyue</span>
<span property="description">Here we might describe this place of worship, and note that it is considered a
pagoda, which Wikidata represents as a subtype of 'place of workship'. </span>
</span>
<div itemprop="geo" itemscope itemtype="http://schema.org/GeoCoordinates">
<meta itemprop="latitude" content="34.501611" />
<meta itemprop="longitude" content="113.015917" />
</div>
<link property="url" href="http://www.wikidata.org/wiki/Q488758" />
@danbri
danbri / gist:9145264
Created February 21, 2014 22:52
<div vocab="http://schema.org/" typeof="PlaceOfWorship https://www.wikidata.org/wiki/Q199451">
<span property="name">Pagoda Songyue</span>
<span property="description">Here we might describe this place of worship, and note that it is considered a
pagoda, which Wikidata represents as a subtype of 'place of workship'. This allows more detailed types to
be agreed at Wikidata, while also mentioning a common well known type from schema.org.
</span>
<div itemprop="geo" itemscope itemtype="http://schema.org/GeoCoordinates">
<meta itemprop="latitude" content="34.501611" />
<meta itemprop="longitude" content="113.015917" />
</div>
@danbri
danbri / gist:9145436
Created February 21, 2014 23:03
div vocab="http://schema.org/" typeof="PlaceOfWorship https://www.wikidata.org/entity/Q199451">
<span property="name">Pagoda Songyue</span>
<span property="description">One of the few intact sixth-century pagodas in China, located at the Songyue Monastery on Mount Song.</span>
<div itemprop="geo" itemscope itemtype="http://schema.org/GeoCoordinates">
<meta itemprop="latitude" content="34.501611" />
<meta itemprop="longitude" content="113.015917" />
</div>
<link property="url" href="http://www.wikidata.org/wiki/Q488758" />
<link property="sameAs" href="https://en.wikipedia.org/wiki/Songyue_Pagoda" />
<link property="sameAs" href="http://www.freebase.com/m/03bz2xf" />
@danbri
danbri / gist:9145489
Created February 21, 2014 23:08
<div vocab="http://schema.org/" typeof="PlaceOfWorship https://www.wikidata.org/entity/Q199451">
<span property="name">Pagoda Songyue</span>
<span property="description">One of the few intact sixth-century pagodas in China, located at the Songyue Monastery on Mount Song.</span>
<link property="url" href="http://www.wikidata.org/wiki/Q488758" />
<link property="sameAs" href="https://en.wikipedia.org/wiki/Songyue_Pagoda" />
<link property="sameAs" href="http://www.freebase.com/m/03bz2xf" />
<div itemprop="geo" itemscope itemtype="http://schema.org/GeoCoordinates">
<meta itemprop="latitude" content="34.501611" />
<meta itemprop="longitude" content="113.015917" />